Pain & tenderness over the lateral condyle of humerus with a painful dorsiflexion of the wrist is indicative of –
**Core Concept**
The question is testing the clinical correlation between a specific physical examination finding and a particular condition. The underlying concept involves the anatomy and innervation of the radial nerve and the clinical presentation of radial nerve palsy.
**Why the Correct Answer is Right**
The correct answer is related to the radial nerve, which is responsible for wrist extension and is innervated by the posterior interosseous nerve, a branch of the radial nerve. The clinical presentation of radial nerve palsy includes pain and tenderness over the lateral condyle of the humerus, where the radial nerve is located, and a decrease or loss of wrist extension, which can be assessed by testing the patient's ability to dorsiflex the wrist. The pain and tenderness are due to the compression or injury of the radial nerve, which can occur due to various reasons such as fractures, dislocations, or compression by soft tissue.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because it does not relate to the radial nerve or its clinical presentation. The median nerve, which is responsible for wrist flexion, is not directly associated with the clinical presentation described in the question.
* **Option B:** This option is incorrect because it is a condition that affects the ulnar nerve, which is responsible for wrist flexion and adduction. The clinical presentation of ulnar nerve palsy includes weakness or paralysis of the intrinsic muscles of the hand and forearm, which is not directly related to the clinical presentation described in the question.
* **Option C:** This option is incorrect because it is a condition that affects the median nerve, which is responsible for wrist flexion. The clinical presentation of median nerve palsy includes weakness or paralysis of the muscles of the anterior forearm and thenar eminence, which is not directly related to the clinical presentation described in the question.
**Clinical Pearl / High-Yield Fact**
The radial nerve is often compressed or injured at the spiral groove of the humerus, which is a common site for radial nerve palsy. This is often seen in patients with supracondylar fractures of the humerus.
**Correct Answer:**
**C. Radial nerve palsy**